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Message-ID: <48776f8b-4e06-1456-1b52-3ea08a22b2a4@synopsys.com>
Date: Mon, 21 Nov 2016 15:00:06 +0000
From: Joao Pinto <Joao.Pinto@...opsys.com>
To: Giuseppe CAVALLARO <peppe.cavallaro@...com>,
Joao Pinto <Joao.Pinto@...opsys.com>,
Rayagond Kokatanur <rayagond@...avyalabs.com>,
Rabin Vincent <rabin@....in>
CC: mued dib <kreptor@...il.com>, David Miller <davem@...emloft.net>,
"Jeff Kirsher" <jeffrey.t.kirsher@...el.com>, <jiri@...lanox.com>,
<saeedm@...lanox.com>, <idosch@...lanox.com>,
netdev <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<CARLOS.PALMINHA@...opsys.com>, <andreas.irestal@...s.com>,
<alexandre.torgue@...com>, <lars.persson@...s.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Synopsys Ethernet QoS Driver
On 21-11-2016 14:36, Giuseppe CAVALLARO wrote:
> Hello Joao
>
> On 11/21/2016 2:48 PM, Joao Pinto wrote:
>> Synopsys QoS IP is a separated hardware component, so it should be reusable by
>> all implementations using it and so have its own "core driver" and platform +
>> pci glue drivers. This is necessary for example in hardware validation, where
>> you prototype an IP and instantiate its drivers and test it.
>>
>> Was there a strong reason to integrate QoS features directly in stmmac and not
>> in synopsys/dwc_eth_qos.*?
>
> We decided to enhance the stmmac on supporting the QoS for several
> reasons; for example the common APIs that the driver already exposed and
> actually suitable for other SYNP chips. Then, PTP, EEE,
> S/RGMII, MMC could be shared among different chips with a minimal
> effort. This meant a lot of code already ready.
>
> For sure, the net-core, Ethtool, mdio parts were reused. Same for the
> glue logic files.
> For the latter, this helped to easily bring-up new platforms also
> because the stmmac uses the HW cap register to auto-configure many
> parts of the MAC core, DMA and modules. This helped many users, AFAIK.
>
> For validation purpose, this is my experience, the stmmac helped
> a lot because people used the same code to validate different HW
> and it was easy to switch to a platform to another one in order to
> verify / check if the support was ok or if a regression was introduced.
> This is important for complex supports like PTP or EEE.
>
> Hoping this can help.
>
> Do not hesitate to contact me for further details
Thanks for the highly detailed info.
My target application is to prototype the Ethernet QoS IP in a FPGA, with a PHY
attached and make hardware validation.
In your opinion a refactored stmmac with the missing QoS features would be
suitable for it?
Thanks.
>
> peppe
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